docker-compose 命令行补全

基本上，在现在的 linux 发行版中 bash-completion 都默认安装了。

$ dpkg -l |grep bash
ii  bash                               4.3-14ubuntu1.2                            amd64        GNU Bourne Again SHell
ii  bash-completion                    1:2.1-4.2ubuntu1.1                         all          programmable completion for the bash shell
ii  command-not-found                  0.3ubuntu16.04.2                           all          Suggest installation of packages in interactive bash sessions